mirror of
https://github.com/querydsl/querydsl.git
synced 2026-06-13 21:01:01 +08:00
536 lines
17 KiB
Java
536 lines
17 KiB
Java
/*
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* Copyright (c) 2010 Mysema Ltd.
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* All rights reserved.
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*
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*/
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package com.mysema.query.sql;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.List;
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import java.util.Set;
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import javax.annotation.Nullable;
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import org.apache.commons.lang.StringUtils;
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import com.mysema.commons.lang.Pair;
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import com.mysema.query.JoinExpression;
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import com.mysema.query.QueryFlag;
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import com.mysema.query.QueryMetadata;
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import com.mysema.query.QueryFlag.Position;
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import com.mysema.query.support.SerializerBase;
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import com.mysema.query.types.*;
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import com.mysema.query.types.template.SimpleTemplate;
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/**
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* SqlSerializer serializes Querydsl queries into SQL
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*
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* @author tiwe
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* @version $Id$
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*/
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public class SQLSerializer extends SerializerBase<SQLSerializer> {
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enum Stage {SELECT, FROM, WHERE, GROUP_BY, HAVING, ORDER_BY}
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private final SerializationContext context = new SerializationContext(){
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@Override
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public void serialize(QueryMetadata metadata, boolean forCountRow) {
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SQLSerializer.this.serializeForQuery(metadata, forCountRow);
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}
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@Override
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public SerializationContext append(String str) {
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SQLSerializer.this.append(str);
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return this;
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}
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@Override
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public void handle(String template, Object... args) {
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Expression<?>[] exprs = new Expression[args.length];
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for (int i = 0; i < args.length; i++){
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exprs[i] = new ConstantImpl<Object>(args[i]);
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}
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SQLSerializer.this.handle(SimpleTemplate.create(Object.class, template, exprs));
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}
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};
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private static final String COMMA = ", ";
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private final List<Path<?>> constantPaths = new ArrayList<Path<?>>();
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private final List<Object> constants = new ArrayList<Object>();
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private final boolean dml;
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private Stage stage = Stage.SELECT;
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private boolean skipParent;
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private RelationalPath<?> entity;
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private final SQLTemplates templates;
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public SQLSerializer(SQLTemplates templates) {
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this(templates, false, false);
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}
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public SQLSerializer(SQLTemplates templates, boolean dml) {
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this(templates, dml, false);
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}
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public SQLSerializer(SQLTemplates templates, boolean dml, boolean dry) {
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super(templates, dry);
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this.templates = templates;
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this.dml = dml;
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}
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private void appendAsColumnName(Path<?> path){
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String column = path.getMetadata().getExpression().toString();
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append(templates.quoteIdentifier(column));
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}
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private void appendAsTableName(Path<?> path){
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String table = path.getAnnotatedElement().getAnnotation(Table.class).value();
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append(templates.quoteIdentifier(table));
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}
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public List<Object> getConstants(){
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return constants;
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}
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public List<Path<?>> getConstantPaths(){
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return constantPaths;
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}
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@SuppressWarnings("unchecked")
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private List<Expression<?>> getIdentifierColumns(List<JoinExpression> joins) {
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JoinExpression join = joins.get(0);
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RelationalPath path = (RelationalPath)join.getTarget();
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if (path.getPrimaryKey() != null){
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return path.getPrimaryKey().getLocalColumns();
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}else{
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return path.getColumns();
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}
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}
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protected SQLTemplates getTemplates(){
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return templates;
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}
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@SuppressWarnings("unchecked")
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private void handleJoinTarget(JoinExpression je) {
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// type specifier
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if (je.getTarget() instanceof RelationalPath && templates.isSupportsAlias()) {
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RelationalPath<?> pe = (RelationalPath<?>) je.getTarget();
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if (pe.getMetadata().getParent() == null) {
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appendAsTableName(pe);
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append(templates.getTableAlias());
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}
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}
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handle(je.getTarget());
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}
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public void serialize(QueryMetadata metadata, boolean forCountRow){
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templates.serialize(metadata, forCountRow, context);
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}
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@SuppressWarnings("unchecked")
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private void serializeForQuery(QueryMetadata metadata, boolean forCountRow) {
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List<? extends Expression<?>> select = metadata.getProjection();
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List<JoinExpression> joins = metadata.getJoins();
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Predicate where = metadata.getWhere();
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List<? extends Expression<?>> groupBy = metadata.getGroupBy();
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Predicate having = metadata.getHaving();
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List<OrderSpecifier<?>> orderBy = metadata.getOrderBy();
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Set<QueryFlag> flags = metadata.getFlags();
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List<Expression<?>> sqlSelect = new ArrayList<Expression<?>>();
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for (Expression<?> selectExpr : select) {
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if (selectExpr instanceof FactoryExpression) {
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// transforms constructor arguments into individual select expressions
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sqlSelect.addAll(((FactoryExpression<?>) selectExpr).getArgs());
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} else {
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sqlSelect.add(selectExpr);
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}
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}
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// start
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serialize(Position.START, flags);
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// select
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Stage oldStage = stage;
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stage = Stage.SELECT;
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if (forCountRow) {
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append(templates.getSelect());
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serialize(Position.AFTER_SELECT, flags);
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if (!metadata.isDistinct()){
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append(templates.getCountStar());
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}else{
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append(templates.getDistinctCountStart());
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if (sqlSelect.isEmpty()){
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handle(COMMA, getIdentifierColumns(joins));
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}else{
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handle(COMMA, sqlSelect);
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}
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append(templates.getDistinctCountEnd());
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}
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} else if (!sqlSelect.isEmpty()) {
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if (!metadata.isDistinct()) {
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append(templates.getSelect());
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} else {
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append(templates.getSelectDistinct());
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}
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serialize(Position.AFTER_SELECT, flags);
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handle(COMMA, sqlSelect);
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}
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serialize(Position.AFTER_PROJECTION, flags);
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// from
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stage = Stage.FROM;
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serializeSources(joins);
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// where
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stage = Stage.WHERE;
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serialize(Position.BEFORE_FILTERS, flags);
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if (where != null) {
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append(templates.getWhere()).handle(where);
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serialize(Position.AFTER_FILTERS, flags);
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}
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// group by
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stage = Stage.GROUP_BY;
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serialize(Position.BEFORE_GROUP_BY, flags);
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if (!groupBy.isEmpty()) {
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append(templates.getGroupBy()).handle(COMMA, groupBy);
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serialize(Position.AFTER_GROUP_BY, flags);
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}
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// having
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stage = Stage.HAVING;
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serialize(Position.BEFORE_HAVING, flags);
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if (having != null) {
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append(templates.getHaving()).handle(having);
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serialize(Position.AFTER_HAVING, flags);
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}
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// order by
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stage = Stage.ORDER_BY;
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serialize(Position.BEFORE_ORDER, flags);
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if (!orderBy.isEmpty() && !forCountRow) {
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append(templates.getOrderBy());
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boolean first = true;
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for (OrderSpecifier<?> os : orderBy) {
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if (!first){
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append(COMMA);
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}
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handle(os.getTarget());
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append(os.getOrder() == Order.ASC ? templates.getAsc() : templates.getDesc());
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first = false;
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}
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serialize(Position.AFTER_ORDER, flags);
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}
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// end
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serialize(Position.END, flags);
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// reset stage
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stage = oldStage;
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}
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public void serializeForDelete(QueryMetadata metadata, RelationalPath<?> entity) {
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this.entity = entity;
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serialize(Position.START, metadata.getFlags());
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if (!serialize(Position.START_OVERRIDE, metadata.getFlags())){
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append(templates.getDeleteFrom());
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}
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handle(entity);
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if (metadata.getWhere() != null) {
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skipParent = true;
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append(templates.getWhere()).handle(metadata.getWhere());
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skipParent = false;
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}
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serialize(Position.END, metadata.getFlags());
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}
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public void serializeForMerge(QueryMetadata metadata, RelationalPath<?> entity, List<Path<?>> keys,
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List<Path<?>> columns, List<Expression<?>> values, @Nullable SubQueryExpression<?> subQuery) {
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this.entity = entity;
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serialize(Position.START, metadata.getFlags());
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if (!serialize(Position.START_OVERRIDE, metadata.getFlags())){
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append(templates.getMergeInto());
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}
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handle(entity);
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append(" ");
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// columns
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if (!columns.isEmpty()){
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skipParent = true;
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append("(").handle(COMMA, columns).append(") ");
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skipParent = false;
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}
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// keys
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if (!keys.isEmpty()){
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append(templates.getKey());
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skipParent = true;
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append("(").handle(COMMA, keys).append(") ");
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skipParent = false;
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}
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if (subQuery != null){
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// subquery
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append("\n");
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serialize(subQuery.getMetadata(), false);
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}else{
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for (int i = 0; i < columns.size(); i++){
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if (values.get(i) instanceof Constant<?>){
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constantPaths.add((Path<?>)columns.get(i));
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}
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}
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// values
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append(templates.getValues());
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append("(").handle(COMMA, values).append(") ");
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}
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serialize(Position.END, metadata.getFlags());
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}
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public void serializeForInsert(QueryMetadata metadata, RelationalPath<?> entity, List<Path<?>> columns,
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List<Expression<?>> values, @Nullable SubQueryExpression<?> subQuery) {
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this.entity = entity;
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serialize(Position.START, metadata.getFlags());
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if (!serialize(Position.START_OVERRIDE, metadata.getFlags())){
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append(templates.getInsertInto());
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}
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handle(entity);
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// columns
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if (!columns.isEmpty()){
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append("(");
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skipParent = true;
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handle(COMMA, columns);
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skipParent = false;
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append(")");
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}
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if (subQuery != null){
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append("\n");
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serialize(subQuery.getMetadata(), false);
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}else{
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for (int i = 0; i < columns.size(); i++){
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if (values.get(i) instanceof Constant<?>){
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constantPaths.add((Path<?>)columns.get(i));
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}
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}
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// values
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append(templates.getValues());
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append("(");
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handle(COMMA, values);
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append(")");
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}
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serialize(Position.END, metadata.getFlags());
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}
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public void serializeForUpdate(QueryMetadata metadata, RelationalPath<?> entity, List<Pair<Path<?>, ?>> updates) {
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this.entity = entity;
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serialize(Position.START, metadata.getFlags());
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if (!serialize(Position.START_OVERRIDE, metadata.getFlags())){
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append(templates.getUpdate());
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}
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handle(entity);
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append("\n");
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append(templates.getSet());
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boolean first = true;
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skipParent = true;
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for (Pair<Path<?>,?> update : updates){
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if (!first){
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append(COMMA);
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}
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handle(update.getFirst());
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append(" = ");
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if (update.getSecond() instanceof Expression<?>){
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if (update.getSecond() instanceof Constant<?>){
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constantPaths.add(update.getFirst());
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}
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handle((Expression<?>)update.getSecond());
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}else{
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constantPaths.add(update.getFirst());
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handle(new ConstantImpl<Object>(update.getSecond()));
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}
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first = false;
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}
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skipParent = false;
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if (metadata.getWhere() != null) {
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append(templates.getWhere()).handle(metadata.getWhere());
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}
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serialize(Position.END, metadata.getFlags());
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}
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private void serializeSources(List<JoinExpression> joins) {
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if (joins.isEmpty()) {
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String dummyTable = templates.getDummyTable();
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if (!StringUtils.isEmpty(dummyTable)){
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append(templates.getFrom());
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append(dummyTable);
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}
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}else{
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append(templates.getFrom());
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for (int i = 0; i < joins.size(); i++) {
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JoinExpression je = joins.get(i);
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if (i > 0) {
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append(templates.getJoinSymbol(je.getType()));
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}
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handleJoinTarget(je);
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if (je.getCondition() != null) {
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append(templates.getOn()).handle(je.getCondition());
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}
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for (Object flag : je.getFlags()){
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append(flag.toString());
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}
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}
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}
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}
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@SuppressWarnings("unchecked")
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public void serializeUnion(SubQueryExpression[] sqs, List<OrderSpecifier<?>> orderBy) {
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// union
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handle(templates.getUnion(), (List)Arrays.asList(sqs));
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// order by
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if (!orderBy.isEmpty()) {
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append(templates.getOrderBy());
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boolean first = true;
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for (OrderSpecifier<?> os : orderBy) {
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if (!first){
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append(COMMA);
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}
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handle(os.getTarget());
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append(os.getOrder() == Order.ASC ? templates.getAsc() : templates.getDesc());
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first = false;
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}
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}
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}
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@SuppressWarnings("unchecked")
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@Override
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public Void visit(Constant<?> expr, Void context) {
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if (expr.getConstant() instanceof Collection){
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append("(");
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boolean first = true;
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for (Object o : ((Collection)expr.getConstant())){
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if (!first){
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append(COMMA);
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}
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append("?");
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constants.add(o);
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// TODO : update constantPaths if necessary
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first = false;
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}
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append(")");
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int size = ((Collection)expr.getConstant()).size() - 1;
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for (int i = 0; i < size; i++){
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constantPaths.add(constantPaths.get(constantPaths.size()-1));
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}
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}else{
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append("?");
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constants.add(expr.getConstant());
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if (constantPaths.size() < constants.size()){
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constantPaths.add(null);
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}
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}
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return null;
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}
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@Override
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public Void visit(ParamExpression<?> param, Void context){
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append("?");
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constants.add(param);
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if (constantPaths.size() < constants.size()){
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constantPaths.add(null);
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}
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return null;
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}
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public Void visit(Path<?> path, Void context) {
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if (dml){
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if (path.equals(entity)){
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appendAsTableName(path);
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return null;
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}else if (entity.equals(path.getMetadata().getParent()) && skipParent){
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appendAsColumnName(path);
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return null;
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}
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}
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if (path.getMetadata().getParent() != null){
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visit(path.getMetadata().getParent(), context);
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append(".");
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}
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append(templates.quoteIdentifier(path.getMetadata().getExpression().toString()));
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return null;
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}
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@Override
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public Void visit(SubQueryExpression<?> query, Void context) {
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append("(");
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serialize(query.getMetadata(), false);
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append(")");
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return null;
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}
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@Override
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protected void visitOperation(Class<?> type, Operator<?> operator, List<Expression<?>> args) {
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if (args.size() == 2
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&& args.get(0) instanceof Path<?>
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&& args.get(1) instanceof Constant<?>
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&& operator != Ops.STRING_CAST
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&& operator != Ops.NUMCAST
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&& operator != SQLTemplates.CAST){
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constantPaths.add((Path<?>)args.get(0));
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}
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if (operator.equals(Ops.STRING_CAST)) {
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String typeName = templates.getTypeForClass(String.class);
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visitOperation(String.class, SQLTemplates.CAST, Arrays.<Expression<?>>asList(args.get(0), ConstantImpl.create(typeName)));
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} else if (operator.equals(Ops.NUMCAST)) {
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Class<?> targetType = (Class<?>) ((Constant<?>) args.get(1)).getConstant();
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String typeName = templates.getTypeForClass(targetType);
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visitOperation(targetType, SQLTemplates.CAST, Arrays.<Expression<?>>asList(args.get(0), ConstantImpl.create(typeName)));
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} else if (operator.equals(Ops.ALIAS)){
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if (stage == Stage.SELECT || stage == Stage.FROM){
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super.visitOperation(type, operator, args);
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}else{
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// handle only target
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handle(args.get(1));
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}
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} else {
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super.visitOperation(type, operator, args);
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}
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}
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}
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